Water Tower Build...........

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Where I live they are building a water tower..... Its about 300 yards from my house....I have noticed a few things........They are using 10" schd 40 pipe and what I think is 3/16" or maybe 1/4" wall for the water baffle........ I'm only guessing based on a visit on a rainy day while no one was there......I have been watching and listening from home as they have been working and took some video.....I can see the welder / grinder combo on the left side of the video...... and I can hear the CAG towards the middle of the tower........Question is..... how does this work..... I mean I get the welding...... but what is the CAG doing....?I'm not understanding what is going on this video other than welding and what I believe is the sound of gouging..... Can anyone shed some light on this process?VID........Precision TIG 185 and MP 210Bobcat 225NTCutmaster 42O/A tanks.... 2 Argon tanks...... 2 C25 TanksFacebook...... F2 Metal WorksETSY....... https://www.etsy.com/shop/F2MetalWorksF2MetalWorks.com....... http://www.f2metalworks.com/
Reply:They could be back gouging a weld joint or gouging out bad weldBacked my CATMA over your CARMA oops clusmy me  What would SATAN do ?? Miller Trailblazer 302 AirPakMiller Digital Elite  Optrel Welding HatArcair K4000Suitcase 12RC / 12 VSHypertherm PM-45Rage 3 sawRusty old Truck
Reply:Done a few tanks.  Usual plate procedure is tack up and then complete one side.  All plate seams are eventually back gouged to clean metal and filled.  Bit of an art to pre-set fit-up to allow for weld distortion.  Has to look good from the highway.  Surprised more newby's aren't interested in tanks.  Doesn't have the glory of doing pipe but around here the pay is the same.   More interesting then just doing butts.  Some tanks are welded 6010 downhill.  A year of this would be good practice for someone expecting to move on to downhill pipe.Pics show an LNG storage tank 150 ft. high by 150 ft. diameter.  Interesting thing was the roof was built inside on the ground and then raised to top of sides by air pressure alone.  Almost 900,000 lbs..  Took 4 hours.p.s.....in this case the roof plates were lapped, sealed on the outside, stitched on the inside and so did not involve back-gouging. Attached ImagesLast edited by OldSparks; 12-13-2014 at 01:19 PM.
Reply:I have watched many being built because we did the dirt work for the tank to sit on and the surrounding dirt work while the tank was being builtGotta love the Bug O Systems they used for a lot of the weldingBacked my CATMA over your CARMA oops clusmy me  What would SATAN do ?? Miller Trailblazer 302 AirPakMiller Digital Elite  Optrel Welding HatArcair K4000Suitcase 12RC / 12 VSHypertherm PM-45Rage 3 sawRusty old Truck
Reply:Good thing your getting a water tower, looks like the trees could use a watering.12v battery, jumper cables, and a 6013.I only have a facebook page. https://www.facebook.com/pages/VPT/244788508917829
Reply:Originally Posted by VPTGood thing your getting a water tower, looks like the trees could use a watering.
Reply:OlsSparks - thanks for the pictures - very cool!Rick V 1 Airco Heliwelder 3A/DDR3 CTC 70/90 amp Stick/Tig Inverters in Parallel1 Lincoln MIG PAK 151 Oxy-Acet
Reply:Did a lot of clean water work for a company called EnComm Midwest. Never did a tower, but did a lot of repair and rebuilding of tanks. Was asked to build a small indoor open top tank once, about 20' diameter, got it started but ran into problems with the fitup of the prefabbed panels.  The company decided to just hire another company that specialized in that. They just put it together without meeting the specs for out of round. Had I known you could get away with that I would have finnished the job. I did scrap a stainless tower once tho, took 5 days with a plasma working from the top down.Yeah, I know, but it'll be ok!Lincoln Square wave 255Miller Vintage mig30a spoolgunThermal Dynamics Pacmaster 100xl plasmaSmith mc torchEllis 1600 band saw
Reply:I got pulled off a job one time to go and install stairs on 80-feet diameter tanks in an oil refinery. New estimator got the bright idea to save money and not have the 8” C-channel used for the stringers rolled. You know how hard it is to bend 40-feet long section of 8” C-channel around a 80-feet diameter x 40-feet tall tanks with a boom truck?Don’t pay any attention to meI’m just a hobbyist!CarlDynasty 300V350-Pro w/pulseSG Spool gun1937 IdealArc-300PowerArc 200ST3 SA-200sVantage 400
Reply:Originally Posted by welderj.....ran into problems with the fitup of the prefabbed panels........They just put it together without meeting the specs for out of round.......
Reply:Originally Posted by OldSparks  Interesting thing was the roof was built inside on the ground and then raised to top of sides by air pressure alone.  Almost 900,000 lbs..  Took 4 hours.p.s.....in this case the roof plates were lapped, sealed on the outside, stitched on the inside and so did not involve back-gouging.
Reply:Originally Posted by snowbird.....do you remember or know at what psi this "stunt" was made ?? curious about the compressor system also.....
Reply:Thank-you Oldsparks.   Just 2 psi lol  makes for 288 pounds per square foot, enough power to lift a  +/-7 inch  thick steel plate